Abrasive stone



FIG. 1 is a left side elvational view of an abrasive stone, showing mynew design, wherein the right side elevational view is a mirror imagethereof;

FIG. 2 is a front elevational view of the abrasive stone, wherein therear elevational view is a mirror image thereof;

FIG. 3 is a bottom plan view of the abrasive stone; and,

FIG. 4 is a top plan view of the abrasive stone.

The ornamental design for an abrasive stone, as shown and described. 